Detachable-blade knife



Bec. 6, 1927.

F. M. WEISS DETACHABLE BLADE KNIFE Patented Dec.V 6,1927.

1 UNiTeasTATEs FREDERICK M. WEISS, OE CHICAGO, ILLINOIS, ASSIGNOI#u To NYE COMPANY, A COR-v l g aesinet are'orrice IOEATION OE ILLINOIS. l

f y nETACHAEIE-BEADE KNIFE.

Appiication mea Eebruaryza 1927.A serial No. 170,979.

This invention relates to improvements in detachable blade knives, and more particularly to a device of that characterfin which the blade is made of thin sheet-metal, which is more or less flexible; so that the handle, inrwhich the blade is mounted for use, not

v only holds the blade, but also reinforces and stiff-ens it to a certain extent.

This invention embodies more particularly an improvement over the knife shown in Brix Patent No. 1,458,104 of June 5, 1923.y

The general operation and construction of the knife is the same as shown in that patent;

and I shall describe and point out in detailv the improvementin the present invention. The'invention willbe fully understood by reference to the following specication and accompanying drawing, in which Figure 1 is a view in side elevation of a device enibodying the features of my invention, Figure 2 is a top plan view, Figure 3 is a view on an enlarged scale showing one of the blades removed from the handle, Figure 4 is a vertical ysectional view of the handle taken on line 4.44 of Fig. 2,' Figure 5 is ay view similar to Fig. 4 showing the blade in place,

and Figure 6 is a view taken as indicated y by the line 6 of Fig. 4. l f

As shown in the drawings, thel handle of the knife comprises a hand-grip portion 10,

having at one end a blade-supporting portion comprising two parallel prongs 11, sep;

arated by a slot 12 with parallel sides. The two prongs 11 are joined near 'their ends by a. pin 13, which extends across the slot`12.

VMounted in the part 10 of the' handle at the end where the prongs 11 join, is a circular spring 17 as shown. This spring is put in place by snapping the same in al suitable pocket formed in the handle as shown and is held against rotation by the pin 17a.

In Fig. 3 is shown one of the blades 50. This blade is made preferably of thin sheetmetal. Blades from such metal can be easily and cheaplyV made; and can ordinarily be Stamped out in the shape shown. Such metal is usually more or less flexible. 2O indicates the cutting edge of the blade. vThe upper edge 21 of the blade is provided with a downwardly and rearwardly extending notch or out 22 with substantially parallel edges, adapted to accommodate the pin 13, when the blade is in place. The back end of the blade is convexly. curved, as

by 23.` Inthis curve and at about the cen-y provided with a `depending tongue 2d ,The

forward end of the part' 10. of the handle, A'

where it meets the rearend of the s'lot12, is concavely curved, as indicated by 30, ;to correspond `with the convex curve 23on the rearend of the blade. The spring 17 is so located that-it 12, as shown.`

In operation, the slot 12 behind the pin 413, and inovedso that the cut or slot 22 embraces the pin 13;' so thatl it .will'be inl position, as indicated by the broken vlines' in Fig. 5. Theback end of the blade is then pressed downward.-

ly, causing the'v bladel to rotate-"on the pin 13, until thenotch 24 atthe rear ofthe blade Snaps over the spring 17. When in this positionfthe convexly curved rear @11d 23 of the blade 'will be a Islight distance' in front of the concavely curved forward edge 30 of the handle. That, is, thev ,recessjor notch 24 of 'the blade willberrested against the spring 17. The-parts are shown ini'thisV position in solid lines in Fig. whereth'e space betweenv the edge 23 of the blade and thefedge 30 of the handle is yindicated by 75. It will be seen that when in this position, that the blade could be pressed rearprojects slightly into the'slot blade 50 is placedrin the r wardly against the spring 17 to close the A space unless meansare `provided tosprev-entsuch rearwardly slidinglof the blade.` That is, the blade would have'a certain amount of 'forward andbackward sliding movement unlessA prevented by suitable*`A means. One of vthe features of thisinvention is to provide such means to prev-ent such lsliding movement of the bladeV as a distinct.

improvement over the blade shown in the Brix Patent No. 1,458,104, above referred to.

VTo prevent this movement above referredto,

another slot 76 that is substantially` vertical. and has substantially ,parallel edges.` .A slight curvature, however, is given to this I provide in the blade 50 near the rear end y slot; VThere is also provided between 4the A y prongs 11 another pina77 near the rear end adapted to be embraced by the slot 76 as the'r blade is moved into place.l "This is shown in Fig. 5. Whenthe pin 77vis thus embraced ship denitely prevents a'longitudinal slid` ing movement of the blade after it is in posi tion. 1

VIn removing the blade, upward pressure on the tongue 26 will release the notch 24 from the spring 17, permitting the back end of the blade to be `sprung, upwardly, to swing embodiments ofmy invention, it is to be' the notch 7 6 clear of the pin 7 7, until the rear end of the blade'is substantially in the positionA shown by the broken lines in Fig. 5. The notch or cut 22 can then be removed from the pin 13 and the blade lifted out.

Itl will be not-ed that the prongs 11 of the handle are considerably thicker Vthan the blade and extend forwardly more than half of the length of the blade. These prongs not only assist in supporting the blade in th-e handle, but also strengthen andstifl'en it and prevent bending of the blade in use.

While I have shown and described certain understood that it is capable of many modi- A lications. Changes therefore in the construction and arrangement Amay be. made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as 'possible in View of the prior art.

VThat I' claim as'new and desire to secure by Letters, Patent, is: Y

1. In a device of the character described, a handle comprising arhand-grip portion and a blade-supporting portion, the blade-supporting `portion comprising two parallelly arranged still prongs with a 'slot between adapted to accommodate a thin flexible blade, a pin joining the prongs near their forward ends, a thin flexible blade adapted to fit in the slot between the prongs, -a notch in the upper edge of the blade adapted to embrace the pin joining the ends'of the prongs, a notch at the back end, of the blade adapted to engage with spring means in the handle, a second pin joining the prongs near their rear ends, and a. notch in the lower edge of the blade adapted tol snugly embrace said pin as theblade is put into position.

2. A thin flexible blade provided with a downwardlyand rearwardly extending slot with parallel sides at its upper edge, and an upwardly extending 'slot at its lower edge,

`the slot between the prongs and provided at its upper edge with a downwardly and rearwardly 'extending notch adapted to embrace said pin, means for yieldingly pressing the blade forward to retain the pin inthe notch, and means to prevent backward sliding movement of the blade against said Yforward kpressing means after the blade is in posi-y tion.

Il. In a device of the character described,r

a handle comprising a hand-grip portion and a blade-supporting portion, the blade-supporting portion comprising two parallelly arranged stiff prongs with a slot between adapted to accommodate a thin flexible blade, a pin joining the prongs near their ends, a thin flexible blade adapted to fit in the slot between the prongs and provided at its upper edge with a yd ov'vnwardly and rearwardly extending notch adapted to embrace said pin, means for yieldingly Vpressing the blade forward to retain the pin in the notch, and means to prevent backward sliding movement of the blade against s aid forward pressing means after the bladeis in position, said means comprising a pin between the prongs and a notch in the blade, said pin adapted to be snugly embraced by said notch as the blade is put into position. v

y 5. In a device of the Character described, a handle comprisinga hand-grip portion and a blade-supporting portion, the blade-supporting portion comprising two parallelly yarranged still prongs with a slot between adapted to accommodate a thin flexible blade, a pin `ioining the prongs near their ends, a thin flexible blade adapted to i'it in the slot between the prongs and provided at its upper edge with a downwardly and rearwardly extending notch adapted to embrace said pin, a notch at the back end ofthe blade adapted to engage with spring means in the handle, and means to prevent backward movement of the blade against saidr spring means after the blade is in position, said means compris'- ing a pin between the prongs and a notch in the blade, said pin adapted to be snugly embraced by said notchas the blade is put into position.

In witness whereof, I have hereunto set my hand this 21 day of Febrt'iary, A.. D. 1927.

`FREDERICK M. WEISS. 

